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RISS 인기검색어
- 검색키워드
- 저자 : Sheroz Khan (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Khan, Md. Noman Habib,Khan, Sheroz The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.4
Present-day solar panels incorporate inverters as their core components. Switching devices driven by specialized power controllers are operated in a transformerless inverter topology. However, some challenges associated with this configuration include the absence of isolation, causing leakage currents to flow through various components toward ground. This inevitably causes power losses, often being also the primary reason for the power inverters' analog equipment failure. In this paper, various aspects of the leakage currents are studied using different circuit analysis methods. The primary objective is to convert the leakage current energy into a usable DC voltage source. The research is focused on harvesting the leakage currents for producing circa 1.1 V, derived from recently developed rectifier circuits, and driving a $200{\Omega}$ load with a power in the milliwatt range. Even though the output voltage level is low, the harvested power could be used for charging small batteries or capacitors, even driving light loads.
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Md. Noman Habib Khan,Sheroz Khan 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.4
Present-day solar panels incorporate inverters as their core components. Switching devices driven by specialized powercontrollers are operated in a transformerless inverter topology. However, some challenges associated with this configurationinclude the absence of isolation, causing leakage currents to flow through various components toward ground. This inevitablycauses power losses, often being also the primary reason for the power inverters’ analog equipment failure. In this paper,various aspects of the leakage currents are studied using different circuit analysis methods. The primary objective is to convertthe leakage current energy into a usable DC voltage source. The research is focused on harvesting the leakage currentsfor producing circa 1.1 V, derived from recently developed rectifier circuits, and driving a 200 Ω load with a power in themilliwatt range. Even though the output voltage level is low, the harvested power could be used for charging small batteries orcapacitors, even driving light loads.
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Daily Activity Monitoring of an Elderly Person for Determining Their Wellness
Atika Arshad,Sheroz Khan,Nur Shahida Midi,AHM Zahirul Alam,Ahmad Fadzil Ismail,Rumana Tasnim 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
The work carried out in this paper aims to present a model based on elderlies daily activities to determine their wellness status. A wellness function is delineated to estimate the health condition of the aged individuals while carrying out their day-to-day routine. The proposed model can also be used to monitor the mobility parameters, such as entry and exit of a room and bed occupancy of an elderly. Simple sensors such as capacitive sensors are equipped into their homes to monitor their behaviour and identify their daily activities via non-contact means. The device will allow extracting daily behavioral patterns of the elderly person. Thus the device will help in providing information to build behavioral model of the person which can foresee the anomalies in their behaviour. In case the elderly is distressed, an alarm can be sent to a receiver unit. The cost effectiveness of the device will ultimately lower the total cost of wellness monitoring of an elderly person. A prototype of the device can be fabricated and broadly tested for extracting precise results.
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